/Engine/Source/Runtime/SlateCore/Public/Fonts/FontCache.h
Font caching implementation Caches characters into textures as needed
class FSlateFontCache : public [ISlateAtlasProvider](API\Runtime\SlateCore\Textures\ISlateAtlasProvider), public [FSlateFlushableAtlasCache](API\Runtime\SlateCore\Textures\FSlateFlushableAtlasCache)